Re: arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires '-mfp32'

[Guenter Roeck]

On 01/05/2016 12:22 AM, Fengguang Wu wrote:
> On Tue, Jan 05, 2016 at 12:09:14AM -0800, Guenter Roeck wrote:
> > On 01/04/2016 11:23 PM, kbuild test robot wrote:
> > > Hi Guenter,
> > >
> > > First bad commit (maybe != root cause):
> > >
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   168309855a7d1e16db751e9c647119fe2d2dc878
> > > commit: 398c7500a1f5f74e207bd2edca1b1721b3cc1f1e MIPS: VDSO: Fix build error with binutils 2.24 and earlier
> > > date:   6 days ago
> > > config: mips-jmr3927_defconfig (attached as .config)
> > > reproduce:
> > >          wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
> > >          chmod +x ~/bin/make.cross
> > >          git checkout 398c7500a1f5f74e207bd2edca1b1721b3cc1f1e
> > >          # save the attached .config to linux build tree
> > >          make.cross ARCH=mips
> > >
> > > All errors (new ones prefixed by >>):
> > >
> > > > > arch/mips/vdso/gettimeofday.c:1:0: error: '-march=r3900' requires '-mfp32'
> > >      /*
> > >      ^
> > AFAICS this is using the mips cross compiler version 4.9.0 from kernel.org [1],
> > which in turn uses binutils 2.24. At least this is what make.cross tries to install.
>
> Oops, sorry. I'm now using the debian MIPS cross compiler 5.2.1 ...
> make.cross has not been updated yet.
No problem. FWIW, I tested my patch with the compiler from Yocto 2.0, which
uses gcc 5.2.0 and binutils 2.25.1, with no problem.

Do you have directions on how to install a debian cross compiler into a Ubuntu system ?
Alternatively, what version of binutils does the mips cross compiler use ?

Thanks,
Guenter

> > I downloaded it and used it to compile both the attached configuration as well
> > as jmr3927_defconfig. Both are building just fine for me. On top of that,
> > arch/mips/vdso/gettimeofday.c should not build in the first place with binutils 2.24
> > (and doesn't build for me).
> >
> > What am I missing ?
> >
> > Guenter
> >
> > ---
> > [1] https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.9.0/x86_64-gcc-4.9.0-nolibc_mips-linux.tar.xz

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